US5003193A - Scan control circuit for hand-held type printer - Google Patents
Scan control circuit for hand-held type printer Download PDFInfo
- Publication number
- US5003193A US5003193A US07/357,966 US35796689A US5003193A US 5003193 A US5003193 A US 5003193A US 35796689 A US35796689 A US 35796689A US 5003193 A US5003193 A US 5003193A
- Authority
- US
- United States
- Prior art keywords
- pulses
- signal
- hand
- frequency
- type printer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00885—Power supply means, e.g. arrangements for the control of power supply to the apparatus or components thereof
- H04N1/00888—Control thereof
- H04N1/00891—Switching on or off, e.g. for saving power when not in use
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
- B41J3/36—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for portability, i.e. hand-held printers or laptop printers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/047—Detection, control or error compensation of scanning velocity or position
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00885—Power supply means, e.g. arrangements for the control of power supply to the apparatus or components thereof
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/10—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using flat picture-bearing surfaces
- H04N1/107—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using flat picture-bearing surfaces with manual scanning
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
- H04N2201/04—Scanning arrangements
- H04N2201/047—Detection, control or error compensation of scanning velocity or position
- H04N2201/04701—Detection of scanning velocity or position
- H04N2201/0471—Detection of scanning velocity or position using dedicated detectors
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
- H04N2201/04—Scanning arrangements
- H04N2201/047—Detection, control or error compensation of scanning velocity or position
- H04N2201/04701—Detection of scanning velocity or position
- H04N2201/04715—Detection of scanning velocity or position by detecting marks or the like, e.g. slits
- H04N2201/04724—Detection of scanning velocity or position by detecting marks or the like, e.g. slits on a separate encoder wheel
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
- H04N2201/04—Scanning arrangements
- H04N2201/047—Detection, control or error compensation of scanning velocity or position
- H04N2201/04701—Detection of scanning velocity or position
- H04N2201/04734—Detecting at frequent intervals, e.g. once per line for sub-scan control
Definitions
- the present invention relates to a hand-held type printer and, more particularly, to a scan control circuit for detecting a stable scanning movement of the hand-held type printer over a copy paper.
- a scan control circuit which includes an encoder having a rotating element for producing pulses in response to the rotation of the rotating element effected by the sliding movement of the hand-held type printer over a copy paper or the like.
- the number of pulses produced from the encoder corresponds to the scan distance of the printer over the copy paper.
- the timing for starting the printing operation is determined.
- the number of pulses generated relative to the scanning is counted, so that when the counted pulse amount reaches a predetermined amount, it is assumed that the scanning operation is stable and, thereupon, power is turned on to start the printing operation.
- the rotating element may be undesirably rotated when the printer receives impact or is imparted a shaking motion, such as when the printer is picked up or when it is placed on a desk.
- the encoder may produce pulses, notwithstanding that the printer is not actually making any scanning movement over a copy paper.
- the power may be turned on too early, i.e., before the printer acquires a stable scanning movement Accordingly, the printed images may be deformed or may be printed with improper darkness.
- the present invention has been developed with a view to substantially solving the above described disadvantages and has for its essential object to provide an improved scan control circuit for a hand-held type printer which can disregard pulses from the encoder produced by operation other than proper scanning operation so that printing operation will start only after the printer has acquired a stable scanning movement.
- a scan control circuit for detecting a stable scanning movement of a hand-held type printer over a copy paper comprises: an encoder for producing pulses in response to the scan movement of the hand-held type printer; a frequency detector for detecting a frequency of the pulses; a comparator for comparing the frequency with a predetermined reference frequency and for producing an enable signal when the frequency exceeds the reference frequency; gate means for transmitting the pulses when the enable signal is produced; and counter means for counting the pulses transmitted through the gate means and for producing a power on signal when a predetermined number of pulses are counted.
- FIG. 1 is a circuit diagram of a scan control circuit for a hand-held type printer according to a preferred embodiment of the present invention.
- FIG. 2 is a graph showing waveforms of signals obtained in the circuit of FIG. 1.
- a scan control circuit 1 for a hand-held type printer includes an encoder 2 for producing pulses Sa in response to the scanning movement of hand-held type printer over a copy paper.
- the number of pulses produced from encoder 2 corresponds to the scanned distance of hand-held type printer over a copy paper.
- the pulses Sa are applied to a stable scan detector 4 and also to a gate circuit 10.
- Stable scan detector 4 is a circuit for comparing the frequency of the pulses Sa from encoder 2 with a reference value and for producing a stable scan signal when the frequency of the pulses Sa becomes greater than the reference value to indicate that the hand-held type printer has acquired a stable scanning movement.
- stable scan detector 4 includes a converter 6 for converting the frequency of pulses Sa to voltage signal Sb, and a comparator 8 for comparing the voltage signal Sb with a predetermined voltage and for producing a signal Sc when the voltage signal Sb exceeds the predetermined voltage indicating that stability is acquired.
- Gate circuit 10 is a circuit for counting the number of pulses Sa from encoder 2 in response to signal Sc from stable scan detector 4, and when the number of pulses Sa exceeds a predetermined number, the pulses Sa are permitted to pass therethrough.
- gate circuit 10 includes an AND gate 12 and an n-bit shift register 14.
- AND gate 12 has one input connected to encoder 2 for receiving pulses Sa and another input connected to comparator 8 for receiving signal Sc.
- the output carrying signal Sd from AND gate 12 is connected to an input of shift register 14 to be shifted.
- Shift register 14 is reset by a low level signal of signal Sc, and is clocked by pulses Sa which have been delayed by delay circuit 16 so as to match the shift timing of the pulses transmitted through the shift register with respect to the phase delay.
- encoder 2 In response to the scanning motion of the hand-held type printer, encoder 2 produces pulses Sa relative to the scanned distance. Pulses Sa are applied to converter 6 for converting the frequency of pulses Sa to voltage signal Sb which is in turn compared with a predetermined voltage in comparator 8.
- the frequency of pulses Sa from encoder 2 will be relatively low and, therefore, the voltage Sb from converter 6 will be below the reference voltage.
- the signal Sc produced from comparator 8 is maintained at a low level.
- AND gate 12 is disabled to prevent pulses Sa to pass therethrough. Accordingly, the unstable pulses Sa, or false pulses Sa, from encoder 2 will not be counted.
- encoder 2 produces pulses Sa at a higher frequency.
- the voltage Sb produced from converter 6 increases and when it becomes greater than the predetermined voltage, comparator 8 produces a high level signal Sc. This is shown at time t0 in FIG. 2.
- the high level signal Sc enables AND gate 12 to permit pulses Sa from encoder 2 to be applied to shift register 14.
- pulses Sa from encoder 2 are delayed in delay circuit 16 and applied to shift register 14 as clock signals.
- n bit pulses Sa (3 bit pulses in the example shown in FIG. 2) from AND gate 12 are applied to shift register 14, shift register 14 produces pulses Se.
- a power control circuit (not shown) is enabled so that the hand-held type printer is powered to start the copy reproducing operation, which is carried out by a known method.
- gate circuit 10 functions as a counter for counting three pulses Sa after AND gate 12 is enabled, and produces pulses after counting the three pulses.
- the pulses Sa from encoder 2 are permitted to pass through gate circuit 10 only when the frequency is greater than a predetermined frequency and also when such high frequency lasts for more than a predetermined number of pulses
- the number of bits of the shift register 14 should be increased.
- stable scan detector 4 and gate circuit 10 can be assembled via software in a CPU.
- an average of a number of pulses Sa per unit time is calculated in a software version of stable scan detector 4, and the number of pulses Sa is counted in a software version of gate circuit 10.
Abstract
Description
Claims (18)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63-132218 | 1987-05-28 | ||
JP13221888A JPH0747341B2 (en) | 1988-05-30 | 1988-05-30 | Manual printer |
Publications (1)
Publication Number | Publication Date |
---|---|
US5003193A true US5003193A (en) | 1991-03-26 |
Family
ID=15076149
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/357,966 Expired - Lifetime US5003193A (en) | 1988-05-30 | 1989-05-30 | Scan control circuit for hand-held type printer |
Country Status (2)
Country | Link |
---|---|
US (1) | US5003193A (en) |
JP (1) | JPH0747341B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5414533A (en) * | 1991-11-20 | 1995-05-09 | Rohm Co. Ltd. | Portable facsimile transmitter with automatic power switch responsive to manual operation |
US5432621A (en) * | 1992-05-23 | 1995-07-11 | Yozan Inc. | Image processing system for enlarging an reducing and image |
US6104845A (en) * | 1995-06-27 | 2000-08-15 | Wizcom Technologies Ltd. | Hand-held scanner with rotary position detector |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4523235A (en) * | 1982-01-11 | 1985-06-11 | Jan Rajchman | Electronic microcopier apparatus |
US4597465A (en) * | 1982-10-27 | 1986-07-01 | A.R.A. Manufacturing Company | Cruise control system and method with overspeed sensor |
US4887165A (en) * | 1987-05-25 | 1989-12-12 | Hitachi, Ltd. | Document editing apparatus having detachable image reader |
US4901163A (en) * | 1986-10-16 | 1990-02-13 | Sharp Kabushiki Kaisha | Image reader for a portable copier |
-
1988
- 1988-05-30 JP JP13221888A patent/JPH0747341B2/en not_active Expired - Fee Related
-
1989
- 1989-05-30 US US07/357,966 patent/US5003193A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4523235A (en) * | 1982-01-11 | 1985-06-11 | Jan Rajchman | Electronic microcopier apparatus |
US4597465A (en) * | 1982-10-27 | 1986-07-01 | A.R.A. Manufacturing Company | Cruise control system and method with overspeed sensor |
US4901163A (en) * | 1986-10-16 | 1990-02-13 | Sharp Kabushiki Kaisha | Image reader for a portable copier |
US4887165A (en) * | 1987-05-25 | 1989-12-12 | Hitachi, Ltd. | Document editing apparatus having detachable image reader |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5414533A (en) * | 1991-11-20 | 1995-05-09 | Rohm Co. Ltd. | Portable facsimile transmitter with automatic power switch responsive to manual operation |
US5432621A (en) * | 1992-05-23 | 1995-07-11 | Yozan Inc. | Image processing system for enlarging an reducing and image |
US6104845A (en) * | 1995-06-27 | 2000-08-15 | Wizcom Technologies Ltd. | Hand-held scanner with rotary position detector |
Also Published As
Publication number | Publication date |
---|---|
JPH0747341B2 (en) | 1995-05-24 |
JPH01301271A (en) | 1989-12-05 |
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Date | Code | Title | Description |
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AS | Assignment |
Owner name: SHARP KABUSHIKI KAISHA, 22-22 NAGAIKE-CHO, ABENO-K Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:YATSUZUKA, YASUFUMI;REEL/FRAME:005086/0456 Effective date: 19890524 |
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